MVC Cart

goto startup class
contain configure method 
to see development or production enviroment we go to see enviromet variable 
right click on project > properties > debug> 
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
IHostingEnvironment env : env object will have parameter called EnviromentName== "Development"
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 public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }
hare in this method we add all the services to used in our applicaiton and controller 

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {}
this method will set HTTP pipeline : means how applicaiton will respont to HTTP method
1                 app.UseBrowserLink() : use to set browser link
2                 app.UseDeveloperExceptionPage() : for errors pages
3                app.UseExceptionHandler("/Home/Error") : this cathes exception and shoe Error page
4            app.UseStaticFiles() prepare static files to served for App (js , xml, img. json blah blah)
5            app.UseMvc(routes =>) : to set MVC route 
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Project Strucure :
wwwroot: all static files will be stored : JS , IMG, CSS,bootstrap
Componenet: kind of replacement to partial view , contianes view , it can we used without modfel binding  , contain Invoke() method
TagHelper: it will store all our custome tag helper
Q: View model, how is differenet from model
Tag helper : very unknown
component : whrere to use 
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why interfaces ?? for category and drink
why mocks: mocks are simple C# classes which will implement interface , them we will create a method and properties .
mocks are to provide data to controllers
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now we will add services to our app
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working with EF:
Create a DBContext CS file in project root 
add the respective table or model 
Add Appsetting file in app root
Give a connection string name 
Now go to start up CS 
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thumb rule : 
Add-migration Name
Update-database
for any changes in AppDBContext file

* we have to add Shopping cart functionality
Add model 
add into AppDBcontext

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tag helper help to render Server side code to HTML
we can create a custome tag which can be used in CSHTML file 
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to work with identity we need to update AppDBContext,
we need to inherit  IdentityDbContext<IdentityUser> instead of DbContext
Now make changes in Startup.cs service for Identity service provided my Entity framework
now make changes in Staratup.cs Configuration to make our application use Identity (app.UseIdentity())